Pre-transarterial Radioembolization of Tumoral Arteriovenous Fistula Associated With Recanalized Umbilical Vein Shunt in a Case of Hepatocellular Carcinoma With Hepatic Vein and Inferior Vena Cava Invasion.

Hepatocellular carcinoma (HCC) is the most common liver cancer and has a propensity to develop arteriovenous fistulas with the surrounding vasculature, making targeted intravascular treatment more difficult. HCC can oftentimes be accompanied by portal hypertension and liver cirrhosis, which can, in turn, cause recanalization of the umbilical vein. In rare circumstances, arteriovenous fistula formation and shunting into the recanalized and enlarged umbilical vein can occur. In the following presented case of HCC, an arteriovenous shunt between the anterior division of the right hepatic artery and a recanalized umbilical vein is demonstrated. Subsequent successful endovascular coil embolization of the fistula was performed to avoid shunting and non-target embolization of the radiation particles in the umbilical vein territory. Post-embolization angiogram with DynaCT and lack of Tc-99m macroaggregated albumin deposition in the umbilical vein distribution confirmed the resolution of the shunt. The patient then received targeted Y-90 transarterial radioembolization locoregional therapy in combination with systemic therapy.